Almarian Anton Werner is a British spy who is getting fake letters, from his sister, needing money. Richard Cadell arranges to bring a lookalike but walks into a trap. The Americans have used him to make a swap for their agent.

The Embassy are struggling to break a new cipher. They ask for Mark Cavelet from the Hungarian Consul. Cadell's meets Victor Tridy but he doesn't want to be Calvet after 20 years of inactivity. Cadell is told to get him back or kill him.

Both the UK agent and US agent are very interested in the sculptor named Milo, a man who molds clay into incredible figures. He also is known to handle plastic explosives quite well.

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